TCP/IP file transfer and a router

Hi

I'm trying to create a Java program that can send a file from 1
Windows PC to another over a TCP/IP connection. As many people use
[wireless] routers, how can I create a TCP connection to PCs that are
connected to the internet via a router? The router has an IP and then
each PC connected to that has its own IP for their local network. How
would the router know which PC is the right one to send the data to?

All help is appreciated, thanks.

.

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